Instruction manual

SM425 INSTRUCTION MANUAL 2.0 SPECIFICATIONS
18 42500001 REV A
up, calibration-gas pressure decrease, temperature high-alarm, blowback, flameout gas
detection, calibration coefficient alarm, startup power stabilization timeout alarm)
Converter Output:
Two channels of mA analog output (4 to 20 mA DC (maximum load resistance of 550 Ω)) and one
mA digital output point (HART) (minimum load resistance of 250 Ω).
Range: any setting between 0 to 100 vol% O
2
in increments 1 vol% O
2
, or partial range is
available
For the log output, the minimum range value is fixed at 0.1 vol% O
2
.
4 to 20 mA DC linear or log can be selected.
Input/output isolation provided.
Output damping: 0 to 255 seconds.
Can select hold or non-hold and set preset value for hold.
Contact Output:
Four channels, contact capacity 30 V DC 3 A, 25 0V AC 3 A (resistive load)
Three of the output channels are selectable to either normally energized or normally de-energized
status.
Delayed functions (0 to 255 seconds) and hysteresis function (0 to 9.9 vol% O
2
) can be added to
high/low alarms.
The following functions are programmable for contact outputs.
(1) Abnormal, (2) High-high alarm, (3) High-alarm, (4) Low-low alarm, (5) Low-alarm, (6)
Maintenance, (7) Calibration, (8) Range switching answer-back, (9) Warm-up, (10) Calibration-
gas pressure decrease (answer-back of contact input), (11) Temperature high-alarm, (12)
Blowback start, (13) Flameout gas detection (answerback of contact input), (14) Calibration
coefficient alarm, (15) Startup power stabilization timeout alarm
Contact output 4 is set to normally operated and fixed error status.
Contact Input:
Two input channels, dry voltage contacts
The following functions are programmable for contact inputs:
(1) Calibration-gas pressure decrease alarm, (2) Range switching (Switched range is fixed), (3)
External calibration start, (4) Process alarm (if this signal is received, the heater power turns off),
(5) Blow-back start
Contact capacity:
Off-state leakage current: 3 mA or less
Self-diagnosis:
Abnormal cell, abnormal cell temperature (low/high), abnormal calibration, defective A/D
converter, and defective digital circuit
Calibration:
Method; zero/span calibration
Calibration mode; automatic, semi-automatic, or manual (All are operated interactively with an
LCD touch panel). Either zero or span can be skipped.
Zero calibration-gas concentration setting range: 0.3 to 100 vol% O
2
(in increments of 0.01 vol%
O
2
in smallest units).
Span calibration-gas concentration setting range: 4.5 to 100 vol% O
2
(in increments of 0.01 vol%
O
2
in smallest units).
Use nitrogen-based gas mixture containing 10 vol% O
2
, and 80 to 100 vol% O
2
for standard zero-
gas and standard span-gas respectively.